1 /* 2 * Copyright 2024 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #include "EventLoop.h" 18 19 #include <unistd.h> 20 21 #include <mutex> 22 23 #include "Utility.h" 24 queueWork(std::function<void ()> && job)25void EventLoop::queueWork(std::function<void()>&& job) { 26 { 27 std::scoped_lock lock(mQueueMutex); 28 mEventsQueue->emplace(std::move(job)); 29 } 30 mCV.notify_all(); 31 } 32 ~EventLoop()33EventLoop::~EventLoop() { 34 mStopping = true; 35 mCV.notify_all(); 36 mRunner->join(); 37 } 38 run()39void EventLoop::run() { 40 mTidPromise.set_value(gettid()); 41 while (!mStopping) { 42 { 43 std::unique_lock lock(mQueueMutex); 44 mCV.wait(lock, [&] { return (!mEventsQueue->empty() || mStopping); }); 45 if (mStopping) { 46 return; 47 } 48 if (!mEventsQueue->empty()) { 49 // Swap the front and back queue 50 mEventsQueue.swap(mEventsProcessing); 51 } 52 } 53 // Process all queued events 54 // lock not needed here since mEventsProcessing is held by this thread uniquely 55 while (!mEventsProcessing->empty() && !mStopping) { 56 // Run the item 57 { 58 std::scoped_lock lock{mRunnerMutex}; 59 (mEventsProcessing->front())(); 60 } 61 mEventsProcessing->pop(); 62 } 63 } 64 } 65 getlooptid()66int EventLoop::getlooptid() { 67 if (!mTid.has_value()) { 68 mTid = mTidFuture.get(); 69 } 70 return *mTid; 71 }